Screen for hammer mills



m2. 17, 1940. F. BEVERLY Y 7 2,225,095

SCREEN FOR HAMMER MILLS Filed April 2'7, 1939 Patented Dec. 17, 1940 g v2,225,095 r SCREEN FOR HAMMER mans.

Frank Beverly, Coleman, Ten, assignor of onehalf to Claud McClellan,Coleman, Tex.

Application April 27, 1939, Serial No. 270,417

1 Claim. (01. 83-11) i This invention relates to a screen for a hamsaidsections when the top member T is closed mer mill, and it is an objectof the invention to surrounding and enclosing the rotor R togetherprovide a screen of this kind provided with means with the hammers D.The assembled sections A to increase the capacity of the mill by thegrindare circular in cross section and substantially 5 ing of feeds thatwould otherwise be thrown back concentric to the axial center of therotor R.

to dry or which would ordinarily gum up or clog In the embodiment of theinvention as illusthe mill. trated in Figure 1, each of the screensections A Another object of the invention is to provide a is providedalong its inner face with the bars I. screen with transversely disposedelements ex- Each of these bars is substantially co-exten'sive tendingacross the inner face of the screen to in length with the length of thesection A and make the feed bounce and re-bounce whereby said bar I iswelded to the inner face of the secthe hammers of the mill are givenmore hits at tion between adjacent rows of screen openings 2. the feedduring the operation of the mill and The bar I is V-sh'aped in crosssection with the thereby materially increasing the output of the apexthereof disposed inwardly from the section mill without any materialincrease in power. A and which apex a provides a sharp edge. The Theinvention consists in the details of conbars I are preferablyequidistantly spaced in a 'struction and in the combination'andarrange-' direction circumferentially of a section A and ment oftheseveral parts of .my improved screen are in parallelism.

for a hammer mill whereby certain important The rotor R rotates n thedirection indicated advantages are attained and the device rendered bythe arrow b' and as' the feed stream dlivered 2o simpler, less expensiveand otherwise more confrom the chute'F is hit by the hammers D, thevenient and advantageous for use, as will be bars I will cause the grainto bounce and rehereinafter more fully set forth. v bounce thuspreventing grain slipping around The novel features ofmyinvention'willhereim, with the rotor. Thiscontlnuedi bouncing of theafter be definitely claimed. l grain; plus the sharp edges a-intheircoaction In order that my invention may be the better with thehammers, results in the grinding oi understood, I will now proceed todescribe the substantially all ofthe grain, thereby greatly insame withreference to the accompanying drawcreasing the output of the mill. Inother words, ing, wherein: Y the particular construction'of the screenas here- Figure 1 is f ag t y Vertical sect onal in described is such astomaterially reduce grain '30 view taken through a hammer milldisclosing a or feed that would have to be thrown back to UNITED ST T SPATENT orrica screen constructed in accordance with an em- .dry r whichwould otherwise gum up or clog bodiment of my invention; I the mill andgreatly reduce its output.

F e 1 a ra entary v ew i p of t The bars I are made of hardened metal.inner face of the screen as herein'disclosed; In th b i t of myinvention as par- 35 Figure 3 is a view similar to Figu e 2i ticularlyillustrated in Figure 3, bars 3 are welded tra ins an ther mbodim nt ofth v nti n; or otherwise secured to the inner face of the Figure 4 fl eary S c l w taken screen section B and arranged in two rows sidecircumferentially of the screen and illustrating by i it th arsextending between adja- 40 another embodiment of the invention; centopenings 4 of the screen section B. The 40 Figure 5 is a view inperspective of the bar bars 3 of one row also alternate or stagger withillustrated in Figure 4, unapplied. respect to the bars 3 of theadjacent row.

In the accompanying drawing, H denotes the In the embodiment of myinvention as illusupper portion of a rotor housing and which has tratedin Figures 4 and 5, the screen C has 5 associated therewith the usualtop member T. "bolted thereto,vas at 5, a readily removable angleMounted as is well known within the housing H bar 6. This 'bar 6 is alsoof a length co-extensive and the top member T when closed is the rotorwith the length of thescreen section Candwhen R carrying the usualhammers D. The rotor R applied has an upstanding flange I, the upper isto be driven in anymanner desired and at a portion of which is formed toprovide a sharp sospeed preferred. Discharging within the housing edge].a

H is a conventional feed chute F. From the foregoing description it isthought to As herein disclosed, the screen is cylindrical be obviousthat a screen for a hammer mill conand comprises two substantiallyduplicate sec- StmOted'iIl accordance with my invention is partions A.one being arranged within the top memticularly well adapted for use byreason of the her T and the other within the housing H and convenienceand facility with which it may be 1 "mil;

screen, members carried by the screen and extending'inwsrdly thereof.said members bein disposed lengthwise or the screen and hsvins theirinner. edges sharp, llld members being 7 spaced apart in s directioncircumi'erentially oi the screen with adjacent members in relativelyclose proximity, each of said members being positioned between adjacentrows oi openings, each of said'members being V-shsped in cross sectionwith its apex inwnrdly disposed.

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